[BUG] /context fails with 400 error related to using an outdated Claude model that I'm not pointed to

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"'claude-3-5-haiku-20241022' does not support
thinking."},"request_id":"req_vrtx_011CV13AWUSuHe9Y38roN9qr"}

What Should Happen?

/context should use the current model of Claude that I am currently use (claude-sonnet-4-5@20250929)

Error Messages/Logs

From Claude: Option 2: Report this as a bug

  This seems like a bug in Claude Code where built-in commands should either:
  - Not inherit thinking mode settings, OR
  - Use a model that supports thinking if thinking mode is enabled

  You can report this at: https://github.com/anthropics/claude-code/issues

Steps to Reproduce

/context

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

Claude Sonnet 4.5

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_